3Danbon F, Solliec C. Aerodynamic torque of a butterfly valve: Influence of an elbow on the time-mean and instantaneous aerodynamic torque[J]. Journal of fluids engineering, 2000, 122(2): 337-344.
4Weerachai Chaiworapuek, et al. An Investigation of the Water Flow Past the Butterfly Valve. AIP Conf. Proc. 1225, 562 (2010); doi: 10.1063/1.3464904.
5ANSYS, 2011, "CFX User's Guide", Ver. 14.0, ANSYS, Inc.